John Gills Exposition of the Bible Commentary - Esther 1:1
Now it came to pass in the days of Ahasuerus ,.... Who he was is not easy to say; almost all the kings of Persia are so named by one or another writer. He cannot be the Ahasuerus in Daniel 9:1 , he was Astyages, the father of Cyaxares or Darius the Mede; but this must be one who had his royal palace in Shushan, which was never the royal city of the Medes, but of the Persians only; nor does he seem to be the Ahasuerus in Ezra 4:6 , who is thought to be Cambyses, the son and successor of... read more
Matthew Henry's Complete Commentary - Esther 1:1-9
Which of the kings of Persia this Ahasuerus was the learned are not agreed. Mordecai is said to have been one of those that were carried captive from Jerusalem (Est. 2:5, 6), whence it should seem that this Ahasuerus was one of the first kings of that empire. Dr. Lightfoot thinks that he was that Artaxerxes who hindered the building of the temple, who is called also Ahasuerus (Ezra 4:6, 7), after his great-grandfather of the Medes, Dan. 9:1. We have here an account, I. Of the vast extent of... read more